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The relationship between the area A of a circle and its circumference C is given by the formula A = $$kC^2$$，where k is a constant. What is the value of k ?
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A.$$\frac{1}{(4π)}$$
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B.$$\frac{1}{(2π)}$$
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C.$$\frac{1}{4}$$
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D.2π
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E.$$4π^2$$
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